Chatman said he just spoke with the 20-year-old last week, who said he was doing well in college.

"We was talking about our plans for the summer. How he was going to kick it and everything," Chatman said.

"I was just outside talking to my neighbor, and I heard two popping sound noises," neighbor Dominic Newman said.

Newman said he coached the 20-year-old in track last year at Shorewood High School.

"Being a father, I just cannot believe that. We're they're to help raise our own and help them become good citizens and to be able to sit there and take the life of one of your own. It's just unbelievable," Newman said.

The second child, 15, is at Children's Hospital in stable condition, police said.